package com.wwe.kotlinstudy.dm.thirteen;

/**
 * @name KotlinStudy
 * @package name：com.wwe.kotlinstudy.dm.thirteen
 * @anthor DavidZhang
 * @time 2018/5/21 12:31
 * @class describe
 */
public interface Subject {
    public void add(Observer observer);
    public void delete(Observer observer);
    public void notifyObservers();
    public void operation();
}
